Welling will play new series character Marcus Pierce, "an accomplished police lieutenant who is everything Lucifer (Tom Ellis) is not — strategic, reserved and well-respected," according to a news release. "When Pierce starts developing a connection with Decker (Lauren German), Lucifer's devilish traits are inflamed."

Several other series revealed casting news at Comic-Con.

Supergirl announced a few additions for its third season:

Adrian Pasdar (Marvel’s Agents of S.H.I.E.L.D.) will play the villain Morgan Edge, a "ruthless real estate developer who will stop at nothing to get what he wants," according to a Warner Bros. release.

Carl Lumbly (Alias) will be M’yrnn J’onzz, a "pacifist religious leader on Mars."

Yael Grobglas (Jane the Virgin) will be Psi, "a psychic villain who uses people’s own minds against them."

Emma Tremblay (Elysium) plays Ruby, "a smart, independently minded National City kid who’s fascinated by Supergirl and ends up in jeopardy because of it."

Peter Capaldi, is that you? The actor, who is leaving after playing the 12th 'Doctor Who' on the BBC America series this season, walks on stage Sunday for his show's session.
Kevin Winter, Getty Images

Cherish Johnson, left, dressed as Sally from 'The Nightmare Before Christmas,' and Megan Severns, dressed as Mystique from the 'X-Men' franchise, pose together on Day 1 of Comic-Con.
Chris Pizzello, Invision/AP

Actors Abigail Spencer, Malcolm Barrett, Goran Višnjić and Matt Lanter of 'Timeless' celebrate at Comic-Con in San Diego after the unlikely renewal of the NBC show because of a fan campaign.
Phillip Faraone, Getty Images, for WIRED

Lowden Nissen, 8, who is dressed as Vault Boy, the mascot of the Vault-Tec corporation from the video game 'Fallout,' poses for a photograph with his family during preview night at Comic-Con.
David Maung, European Pressphoto Agency

Scarlett Lewis, 4, who is dressed as the 'Dragon Ball' character Goku, walks with her family outside the San Diego Convention Center during Comic-Con's preview night.
David Maung, European Pressphoto Agency